匯入pom依賴

<!--        匯入依賴-->
<!--        xls 03-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.9</version>
        </dependency>

<!--        xls 07-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.9</version>
        </dependency>

<!--        日期格式化工具-->
        <dependency>
            <groupId>joda-time</groupId>
            <artifactId>joda-time</artifactId>
            <version>2.9.9</version>
        </dependency>

<!--        test-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
        </dependency>

建立個檔案測試一下

public class ExcelUtil {

    String PATH = "D:\\JavaClass\\mydemo\\src";

    @Test
    public void testWrte() throws IOException {
        // 建立一個工作簿
//        Workbook workbook = new HSSFWorkbook();  // 03
        Workbook workbook = new XSSFWorkbook(); // 07
        //  建立一個工作表
        Sheet sheet = workbook.createSheet("統計表");
        
 
// 建立一行
        Row row1 = sheet.createRow(0);
        // 建立一個單元格
        Cell cell1 = row1.createCell(0);
        // 填入資料
        cell1.setCellValue("新增666");

        // 2 ,1
        Row row2 = sheet.createRow(1);
        Cell cell2 = row2.createCell(0);
        String s = new DateTime().toString("yyyy-MM-dd HH:mm:ss");
        cell2.setCellValue(s);

        
 
// 生成一張表
        FileOutputStream fileOutputStream = null;
        fileOutputStream = new FileOutputStream(PATH + "單元測試.xls");

        workbook.write(fileOutputStream);
        // 關閉流
        fileOutputStream.close();
        System.out.println("生成完成");
    }
}

執行檔案發現專案的根目錄下會出現一個單元測試.xls的檔案

讀取xls檔案的資料

@Test
    public void testRead() throws IOException{
        // 讀表資料
        FileInputStream inputStream = new FileInputStream(PATH + "單元測試.xls");

        Workbook workbook = new HSSFWorkbook();
        Sheet sheet = workbook.getSheet("統計表");
        Row row = sheet.getRow(0);
        Cell cell = row.getCell(0);

        System.out.println(cell.getStringCellValue());

        inputStream.close();

    }